| 摘要 |
PROBLEM TO BE SOLVED: To provide a buoyancy valve type automatic vacuum opening/closing device capable of automatically vacuum-discharging sewage water accumulated inside a storage tank which is a sewage basin.SOLUTION: Inside a storage tank X, a small-sized atmosphere open type ball valve 8 incorporated inside a sealed container 7 positioned inside the storage tank is opened and closed by utilizing buoyancy of a float 13 positioned inside the tank, a vacuum pressure inside a suction hose communicated with the valve is transmitted to a cylinder 6 of a main ball valve 2 positioned outside the storage tank to open and close the valve, and a fluid inside the storage tank is vacuum-discharged. |
